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Painful wear and tear on the knees often leads to knee replacement surgery. Standard implants come in different sizes, much like a pair of shoes, but a new 3D approach offers implants tailored to a patient's specific anatomy.

The new option, offered by a Massachusetts company called Conformis, begins with CT imaging from the hip through the knee and ankle.

Special software converts the data into a 3D model of the patient's unique bone structure.

It was the best option for Milton Rodriguez, 50, who had his knee replaced after 20 years of pain and two arthroscopic surgeries.